How Much Silicone Do You Need for a Resin Mould?

How much silicone is required for a resin mould?

Determining the correct amount of silicone for your resin mould is essential to achieve a successful casting and minimise material waste. Here’s a simple guide for getting your measurements right.

Working Out the Amount of Silicone Needed

Begin by measuring the volume of your chosen mould container. Place your master object (the original piece you wish to replicate) inside, and fill the container with water to the desired height. Remove the master and measure the remaining water—this gives you the displacement or the precise volume of silicone required. To ensure full coverage, add an extra 10–20% silicone to your calculation. This buffer helps prevent shortages, accommodates spillage, and ensures the master is completely coated.

Practical Preparation and Pouring Tips

Use a silicone such as “Pure Mould” – Translucent Liquid Silicone Rubber for Mould Making for reliable results. Always mix according to the manufacturer’s instructions—many silicones require a straightforward 1:1 ratio, making the process easier, especially for beginners. When pouring, do so slowly and from one corner to reduce bubbles and improve the surface finish of your finished mould. Work on a level surface to avoid uneven distribution.

When Precise Measurement Really Matters

If you’re working with large or detailed masters where coverage is critical.
When using premium or specialist silicone products to avoid unnecessary waste.
In professional or repeatable production, accurate calculations save time and material costs long-term.

Related guides

How To Make A Mould For Resin

Taking the time to measure your silicone correctly means fewer surprises and better-quality resin moulds. For a step-by-step guide on crafting your own moulds, browse our full advice at how to make a mould for resin.